freeswitch-stable: backport apr fix

freeswitch-stable: backport apr fix

Backport from master.

The macro APR_TRY_COMPILE_NO_WARNING included in apr/apr-util is
incorrect. It results in extra brackets being put into conftest.c, for
example:

  #include "confdefs.h"

[
  #include <stddef.h>
  #include <iconv.h>
  ]
int main(int argc, const char *const *argv) {
[
  iconv(0,(char **)0,(size_t *)0,(char **)0,(size_t *)0);
  ]
  return 0; }

The test always fails with:

error: expected identifier or '(' before '[' token

The following checks are affected:

- variable length arrays
- type of inbuf parameter to iconv

Fix from upstream (Apache).

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>